Combined grinding-wheel guard and rest



W. H. SUMBLING. COMBINED GRINDING WHEEL GUARD AND BEST. I APPLICATION FILED JUNE 1, I920. 19369741, Patented Aug. 9, 1921.

2 SHEETS-SHEET I- -W. H. SUMBLING.

COMBINED GRINDING WHEEL GUARDAND REST.

APPLICATION FILED JUNE I, I920- L 386fi41l n Patented. A g- 9, 1921. I

2 SHEETS-SHEET 2- iii ilk

WILLIAM HENRY SUMBLING, OF TORONTO, QNTARIQ, CANADA, ASSIGNOR TO S'UMBLING MACHINERY CGMLANY, LIMITED, 0F TORONTO, ONTARIO, GAN- ADA.

COIIIBINED GRIDTDIIQ'G-VIHEEL GUARD AND REST.

Application filed June 1,

To all whom it may concern.-

Be it known that l, lVILLIAM HENRY SUMBLING, of the city of Toronto, county of York, Province of Ontario, Canada, a subject of the King of Great Britain, have invented certain new and useful Improvements in Combined Grinding-Wheel Guards and Rests, of which the following is a specification.

My invention relates to improvements in combined grinding-wheel guards and rests, and one object of my invention is to provide a guard designed to support a rest, which guard may be adjusted as the occasion may require to compensate for the wearing away of the grinding wheel, and to so mount the rest on the guard that the rest may be given the desired adjustments there'- on, so that when the guard has been adjusted to compensate for the wear of the grindingwheel, the member against which the work is held may be adjusted so that its upper face or surface may be held in a horizontal plane. A still further object of my invention is to improve the construction of the guard patented to me in the United States on the 24th day of February, 1920, $51,332,009, sothat I may be able to use an ordinary standard machine bolt to couple the guard to the frame of the grinder, and otherwise to improve the construction of the said guard. A still further object of my invention is to provide improved clamping or fastening means both for the guard andthe rest, so that the user thereof will always have at hand the necessary means for adjusting the guard and rest and locking the same in position.'

In the followin specification 1 shall set forth my invention and certain modifications thereof, and what I claim as new will be stated in the claims forming part thereof.

Figure 1 is a plan viewof my combined guard and rest, showing the guard attached to the frame of a grinding machine, part of which is shown. Fig. 2 is a side elevation of my combined guard and rest. Fig. 3 is a front elevation of my combined guard and rest, showing the portion of the grinder frame which carries the guard. Fig. i is a side elevation of a modified form of the guard. Fig. 5 is a horizontal cross-section on the line 55, Fig. 4, and Fig. 6 is a side Specification of Letters Patent.

Patented Aug. 9, i921.

1920. Serial No. 385,455.

elevation of a modified form of the bracket carried by the grinder frame which supports the attaching means for the guard.

In my Patents numbered 1,294,565, and 1,832,009, dated respectively Feb. 2 1, 1920, and Feb. 18, 1919, I show a long slot formed in the plate of the guard, and I have found from experience that if E make two slots in the said plate, one whereby the guard is mounted on the arbor, or boss carried by the frame of the machine, and the other considerably smaller in size through which the fastening means passes, I am enabled to save in weight without sacrificing strength, andyet secure the range of adjustments desired. in fact through my improved construction of the guard, I am not confined to using a slet closed at both ends whereby the plate is mounted over the boss or arbor.

In my first-mentioned patent, means was provided whereby the guard could be moved transversely of the arbor and circumferentially of the wheel, but the rest could not be independently adjusted to the extent of placing the upper surface thereof in a horizontal p ane. Where it is required to grind a part or the work to be more or less at right angles to another part thereof, it was found that unless the machinist had a fixed bed or support held with work-supporting surface in a horizontal plane on which the work could be held, accurate worlr could not be done. In this present invention the rest can be adjusted so that the work-supporting ele ment will be moved into the horizontal after the guard itself has been given the necessary adjustment. in the present construction I preferably position the slots in the guard plate so that they will extend transversely of the machine, and preferably use a curved slot in the bracket carried by the machine frame through which the fastening means for the guard'passes, thereby giving me independent horizontal and circular adjustments of the'guard. When the wheel wears considerably, the guard must be adjusted circumferentially thereof so as to reduce the size of the opening above a line passing herizontally through the arbor, which is desirable' according to the best practice. This circumferential adjustment necessarily will leave the top face supporting the rest at an angle to the horizontal, and therefore independent adjustment of the rest must be had so that'thetop face thereof may be adjusted into horizontal position.

It must be clearly understood that the opening in the guard plate through'which the arbor passes,as well as the opening through which the fastening means passes, need not be slots, but may be openings of such shape as to permit the guard to be mounted and clamped in place so as to provide for the required adjustment of the guard. Since the rest is capable of a considerable horizontal adjustment, the horizontal adjustment so obtained may, in some cases, render unnecessary the horizontal and circumferential adjustment of the guard. In the drawings, like characters of reference refer to the same parts.

The grinder frame used to illustrate my invention therewith may "comprise any suitable frame A, a portion of which only is shown, and j ournaled therein is an arbor C to which is attached, in any suitable way, the grinding wheel D shown by dotted lines in Fig. 2

Secured to, or formed a part of, the frame A is a bracket E. The guard comprises a plate 3 which supports a flange 4 within which rotates the grinding wheel D. The flange 1' is cutaway as shown at 5 to per- 7 mit the work to be brought into 'edntact with the wheel D. Formed centrally in the plate is an opening 6, preferably in the form of a slot which extends transversely of the machine. It will be seen uponreferring particularly to Fig. 2 that the arbor passes through said slot. To prevent the sides of "thevslot 6 coming in contactwith the arbor C, I. prefer to provide theiframe A with a'.

boss 13 which extends preferably through to the inner side of the plate 3. Though I do not confine myself to using the said boss,

I prefer to use the same because I can keep the plate 3 out of contact with the said arbor.

Since the opening 6 will be cast in the plate 8 so that it may be readily mounted over the boss B, I do not have to machine said opening, and therefore I can reduce cost of manufacture. 7 is a slot preferably curved and formed in the bracket E, and extending through this slot is an ordinary machine bolt 8. F is an opening preferably in the 7 form of a slot, formed in the plate 3 and communicating with the slot 7 and through thiss'lot F extends the bolt 8. As will be seen clearly in Fig. '1,the slot F is preferably countersunk so as to. forma housing for'thehead 9 of the bolt8. The size of this head is such that it will contact with the bolt 8is threadedas shown at 11 and screwing thereon is a nut 12 provided with a head 13 in'the form ofa cross bar. This nut and its head will always be carried by the bolt 8, and without further descrlption 7 it will be understood that the co-a'ction between said nut and bolt mounted substan tially in the manner shown will firmly lock the guard in adjusted position." Since the guard through the medium of its plate 3 rests in contact either-with the boss 13 or thearborC, pressure against therest will not shift the guard. u

Since I prefer to use the slot F, the same is formed to extend transversely of the machine frame, and it will be understood'that by retracting the nut12 the guard can be loosened and adjusted horizontally. 7

If I use an opening in the form of curved slot '7, by retracting the nut 12 the guard can be adjusted circumferentially of the wheel D, for the purpose before set forth. Secured to, or formed a part of, the guard, is a bracket 14 provided with a longitudinal slot 15 oaenin therethrou h. b

The said slot is constructed to provide shoul ders 16 which form flanges against which rests the head 17 of the bolt 18. The said head 171s countersunk in the bracket 14 and rests in the-said slot 15, and since the sides of this head contact with the walls 19 of the slot 15, the bolt is prevented from turning.

The said boltis threaded to receive the nut 20 which is. provided with a head 21 in the form of an arm. .a The partsdescribed functionate in like manner to the clamping means already described in connection with the guard itself. Formed'in'the arm 22 of the bracket 23 is avertical slot 24 through which extends the bolt 18. Upon referring tends in front of the wheel 26 is a, rest, and the same is provided with a threaded bolt 27 which extends through a longitudinal slot 28 formed in the arm 25, and screws into the nut 29 constructed substantially the same as the nuts 12 and 20 alreadyfdescribedv By reason of the slot 15 the bracket28,

may beadjusted horizontally in respect of the wheel D, and by means of the slot '28 the rest26 may be adjusted transversely of the wheel D, or otherwise. r

Suflicient has been shown to support the Y claim that I may dispense with the use of the openings formed in the plate 3 in the form of slots, in some cases because of the range of adjustments possessed by they bracket 28 and rest26, though the use. of the said slotsis preferred because of the wider range of adjustment to the had there with. i v,

As before mentioned I lighten the construction of the plate 3 by forming two separate openings therein, for example the slots 6 and F. The metal separating these slots may be termed a bridge wall 30, and it is this portion of the said plate 3 that stifi'ens the same.

in Fig. 4% I show the opening or slot 6 as having only one closed end, and have otherwise modified the shape of the plate 3. This modification enables me to manipulate to advantage certain classes of work. The bracket E shown in Fig. 6 has a modified opening 7 in the form of a round hole through which passes the bolt 8.

In order to make the plate 3 in the modi fied form shown in Fig. 4c 1 cast therewith a strengthening rib a, so as to give added strength to the bridge wall 30.

Obviously various changes in details of construction may be suggested by one skilled in the art without going outside the scope of the appended claims.

What I claim is:

1. In a grinding machine, the combination with a grinding wheel ournaled therein, of a guard for said wheel having a plate provided with an opening centrally thereof through which extends the arbor of said wheel; means coupled to the frame of said machine and adapted to co-act with said plate; to permit said guard to be moved transversely of said machine and circumferentially of said wheel and designed to firmly support said guard inadjusted position; a slotted bracket carried by said guard at one side and projecting forwardly thereof and disposed substantially in a vertical plane, and means adjustably carried by said lastmentionedbracket and adapted to be adjust ed to provide a horizontal rest for the work when the adjustment of said guard renders this adjustment necessary.

2. In a grinding machine the combination of a standard having a projecting boss; a slotted bracket carried by said standard; a guard having a plate provided with two slots opening therethrough, which are spaced apart, one of said slots being adapted to receive said boss and positioned to extend through the axis of said plate; the other slot being positioned to the rear of the first-mentioned slot and somewhat below the same; fastening means held in said slo ted bracket and in the second-mentioned slot formed in said plate to clamp said plate firmly to said bracket; a slotted bracket carried by said guard at one side and projecting forwardly thereof and disposed in substantially a vertical plane, and a tool rest adjustably carried by said last-mentioned bracket and adapted to be adjusted into horizontal position when the adjustment of said guard makes this adjustment necessary.

3. In a grinding machine, the combination with a grinding wheel j ournaled there in, of a guard for said wheel having a plate provided with an opening centrally thereof through which extends the arbor of said wheel; means coupled to the frame of said machine and adapted to co-act with said plate to permit said guard to be moved transversely of said machine and circumferentially of said wheel and designed to firmly support said guard in adjusted position; a slotted bracket carried by said guard at one side and projecting forwardly thereof and disposed substantially in a vertical plane; a rest comprising a right angle bracket provided with a longitudinal slot in the vertical and horizontal members thereof; fastening means held in the slotted bracket carried by said guard and extending through the vertical slot formed in said right-angle bracket; the combination set forth permitting vertical horizontal and circular adjustment of said right angle bracket; a tool rest supported by said right angle bracket on the horizontal member thereof, and fastening mean coupling said tool rest to said horizontal member and whereby said tool rest may be adjusted thereon.

4. As a new article of manufacture, a guard having a plate provided with two openings therethrough, which are spaced apart, one of said openings being of greater diameter than the other and positioned to extend through the axis of said plate; and a slotted bracket carried by said guard at one side and projecting forwardly thereof and disposed in substantially a vertical plane.

5. As a new article of manufacture, a guard having a plate provided with two slots opening therethrough, which are spaced apart, one of said slots being of greater diameter than the other and positioned to extend through the axis of said plate; the other slot being positioned to the rear of the firstmentioned slot and somewhat below the same; and a slotted bracket WILLIAM HENRY SUMBLING. 

